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Old 06-28-2006, 12:43 PM   #1
digital vortex
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Setting crossover frequency - ALSA vs. Audigy?

Does anyone have any experience with changing the crossover frequency for the Creative Audigy soundcard? I have a 5.1 system (Klipsh Promedia Ultra) and there's too much bass coming through my satellite speakers - I'd like to send the lower frequencies to the subwoofer.

I've played with the "LFE" and "PCM LFE" levels in alsamixer and not noticed any effects. I've also searched the forums for this topic and no good results turn up.

Any help would be much appreciated - thank you.

Last edited by digital vortex; 06-28-2006 at 12:46 PM.
Old 11-07-2006, 12:44 AM   #2
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I used to have SB Live! 5.1, in the alsa mixer there was a control named 3D Control Sigmatel - Rear Depth but when I switched to audigy I lost this control and I only have now 3D Control - Depth which is usable only with CD's that are not played digitally. The Rear Depth in Live did what you ask to do in audigy! BASS REDIRECTION and also 4 Speaker stereo with bass redirection in stereo files just like those cards play in windows! I know because I have the same problem when I watch a 5.1 movie everything works fine but my satellite speakers cannot respond under 120Hz so I lose all the low frequencies from front, rear and center channels!!I only get from the subwoofer the sound that movie gives to it! I cannot understand why in Live! 5.1 bass redirection could happen and in audigy cannot happen!!!!! I 've also searched for help through internet but nothing! I found only your notice! No one else has this problem? I think all audigy cards and versions have the same controls. But what suprised me sadly was that audigy have a lot less controls than Live!5.1 in the mixer which is very strange!
Old 11-07-2006, 02:35 AM   #3
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From the manual, your sound unit already has a high-pass filter for the satelites. I do not know what order or antunation, but turning on high-pass in software will change the sound output. Actually, the satelites will not output 120 hertz like they are designed. They will be producing between 200 to 240 hertz. This means you are going to have a huge gap. Your satelites should be about 6 feet away from the subwoofer because of the cut-off frequency. If the bass is too much, adjust the subwoofer volume. The corner or under some computer desktops does excite bass frequencies. If you place the satelites on speaker stands like at ear level or a little higher, the bass will be a lot less.

Since the rear satelites are directional, I recommend putting them away from the listening area, but at a diffused material. The diffused material has valleys, platues, hills, etc to scatter the sound waves. The reason for this, the rear channels is supposed to provide ambient which directional speakers can not do. Some people say this is wrong, but this is the right way to use directional speakers for the rear channels in a surround sound setup. Movies and other sound material will sound a lot better because the dominence of the rears is a lot less and the fronts can provide sound that you may not know is there.


alsa, audigy, crossover, frequency

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